Buy a syringe. You can either draw the fluid out or push the fluid in.
http://www.amazon.co.uk/Large-Plastic-Syringe-plastic-tubing/dp/B009LEEOVW
Thanks. Is 100ml enough to push through the whole system in one go, do you think?
@lynx started
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Buy a syringe. You can either draw the fluid out or push the fluid in.
http://www.amazon.co.uk/Large-Plastic-Syringe-plastic-tubing/dp/B009LEEOVW